The mass-shooting at a midnight screening of "The Dark Knight Rises" in Aurora, Colo., has left 12 dead and 59 people wounded, Aurora Police Chief Dan Oates told reporters Friday morning.

Oates confirmed that the suspect was James Holmes, a 24-year-old graduate student who had only one previous run-in with the law — a speeding ticket from October 2011.

"At this time we are confident that he acted alone," Oates said.

Holmes' apartment has been booby trapped, Oates said, with various incendiary and chemical devices. Neighbors have been evacuated.

"It may be resolved in hours or days," Oates said, noting that they had several experts on the scene.

Holmes did not resist arrest, according to the police chief. The officers apprehended him outside of his white Hyundai behiind the theater. It appears that he used four weapons during the shooting spree — two handguns, a shotgun and an assault rifle. The police could not yet calculate how many rounds were fired, but 71 people were shot, including those in a theater adjacent to the one at the center of the attack.

He set off two devices to distract the crowd, which Oates described as containing "some sort of irritant or smoke." Holmes was outfitted in ballistic armor and a gas mask.

Ten people died in the theater and police are still identifying their bodies. Two victims died of injuries they sustained during the shooting at nearby hospitals.

Colorado Governor John Hickenlooper and Aurora Mayor Steve Hogan also addressed the media, telling the press that although the city and state had taken a blow, both would rebound.

"This is a safe city, a safe state and a safe country," Hickenlooper said. "Aurora is one of the great cities not just of Colorado, but this country. We will come back stronger than ever."